In the original 'Star Wars' movie, there is a small toaster-sized and shaped robot on the Death Star that guides Stormtroopers to where they need to go. I always liked that robot because I could imagine how to build it - and it served a real purpose.

Building a robot that has legs and walks around is a very expensive proposition. Mother Nature has created many wonderful things, but one thing we do have that nature doesn't is the wheel, a continuous rotating joint, and tracks, so we need to make use of inventions to make things simpler.

Building robot versions of people is very expensive.

Colin Angle Quotes